| /* |
| * linux/arch/arm/kernel/atags_compat.c |
| * |
| * Copyright (C) 2001 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * We keep the old params compatibility cruft in one place (here) |
| * so we don't end up with lots of mess around other places. |
| * |
| * NOTE: |
| * The old struct param_struct is deprecated, but it will be kept in |
| * the kernel for 5 years from now (2001). This will allow boot loaders |
| * to convert to the new struct tag way. |
| */ |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/init.h> |
| |
| #include <asm/setup.h> |
| #include <asm/mach-types.h> |
| #include <asm/page.h> |
| |
| #include <asm/mach/arch.h> |
| |
| #include "atags.h" |
| |
| /* |
| * Usage: |
| * - do not go blindly adding fields, add them at the end |
| * - when adding fields, don't rely on the address until |
| * a patch from me has been released |
| * - unused fields should be zero (for future expansion) |
| * - this structure is relatively short-lived - only |
| * guaranteed to contain useful data in setup_arch() |
| * |
| * This is the old deprecated way to pass parameters to the kernel |
| */ |
| struct param_struct { |
| union { |
| struct { |
| unsigned long page_size; /* 0 */ |
| unsigned long nr_pages; /* 4 */ |
| unsigned long ramdisk_size; /* 8 */ |
| unsigned long flags; /* 12 */ |
| #define FLAG_READONLY 1 |
| #define FLAG_RDLOAD 4 |
| #define FLAG_RDPROMPT 8 |
| unsigned long rootdev; /* 16 */ |
| unsigned long video_num_cols; /* 20 */ |
| unsigned long video_num_rows; /* 24 */ |
| unsigned long video_x; /* 28 */ |
| unsigned long video_y; /* 32 */ |
| unsigned long memc_control_reg; /* 36 */ |
| unsigned char sounddefault; /* 40 */ |
| unsigned char adfsdrives; /* 41 */ |
| unsigned char bytes_per_char_h; /* 42 */ |
| unsigned char bytes_per_char_v; /* 43 */ |
| unsigned long pages_in_bank[4]; /* 44 */ |
| unsigned long pages_in_vram; /* 60 */ |
| unsigned long initrd_start; /* 64 */ |
| unsigned long initrd_size; /* 68 */ |
| unsigned long rd_start; /* 72 */ |
| unsigned long system_rev; /* 76 */ |
| unsigned long system_serial_low; /* 80 */ |
| unsigned long system_serial_high; /* 84 */ |
| unsigned long mem_fclk_21285; /* 88 */ |
| } s; |
| char unused[256]; |
| } u1; |
| union { |
| char paths[8][128]; |
| struct { |
| unsigned long magic; |
| char n[1024 - sizeof(unsigned long)]; |
| } s; |
| } u2; |
| char commandline[COMMAND_LINE_SIZE]; |
| }; |
| |
| static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size) |
| { |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_MEM; |
| tag->hdr.size = tag_size(tag_mem32); |
| tag->u.mem.size = size; |
| tag->u.mem.start = start; |
| |
| return tag; |
| } |
| |
| static void __init build_tag_list(struct param_struct *params, void *taglist) |
| { |
| struct tag *tag = taglist; |
| |
| if (params->u1.s.page_size != PAGE_SIZE) { |
| pr_warn("Warning: bad configuration page, trying to continue\n"); |
| return; |
| } |
| |
| printk(KERN_DEBUG "Converting old-style param struct to taglist\n"); |
| |
| #ifdef CONFIG_ARCH_NETWINDER |
| if (params->u1.s.nr_pages != 0x02000 && |
| params->u1.s.nr_pages != 0x04000 && |
| params->u1.s.nr_pages != 0x08000 && |
| params->u1.s.nr_pages != 0x10000) { |
| pr_warn("Warning: bad NeTTrom parameters detected, using defaults\n"); |
| |
| params->u1.s.nr_pages = 0x1000; /* 16MB */ |
| params->u1.s.ramdisk_size = 0; |
| params->u1.s.flags = FLAG_READONLY; |
| params->u1.s.initrd_start = 0; |
| params->u1.s.initrd_size = 0; |
| params->u1.s.rd_start = 0; |
| } |
| #endif |
| |
| tag->hdr.tag = ATAG_CORE; |
| tag->hdr.size = tag_size(tag_core); |
| tag->u.core.flags = params->u1.s.flags & FLAG_READONLY; |
| tag->u.core.pagesize = params->u1.s.page_size; |
| tag->u.core.rootdev = params->u1.s.rootdev; |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_RAMDISK; |
| tag->hdr.size = tag_size(tag_ramdisk); |
| tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) | |
| (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0); |
| tag->u.ramdisk.size = params->u1.s.ramdisk_size; |
| tag->u.ramdisk.start = params->u1.s.rd_start; |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_INITRD; |
| tag->hdr.size = tag_size(tag_initrd); |
| tag->u.initrd.start = params->u1.s.initrd_start; |
| tag->u.initrd.size = params->u1.s.initrd_size; |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_SERIAL; |
| tag->hdr.size = tag_size(tag_serialnr); |
| tag->u.serialnr.low = params->u1.s.system_serial_low; |
| tag->u.serialnr.high = params->u1.s.system_serial_high; |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_REVISION; |
| tag->hdr.size = tag_size(tag_revision); |
| tag->u.revision.rev = params->u1.s.system_rev; |
| |
| #ifdef CONFIG_ARCH_ACORN |
| if (machine_is_riscpc()) { |
| int i; |
| for (i = 0; i < 4; i++) |
| tag = memtag(tag, PHYS_OFFSET + (i << 26), |
| params->u1.s.pages_in_bank[i] * PAGE_SIZE); |
| } else |
| #endif |
| tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE); |
| |
| #ifdef CONFIG_FOOTBRIDGE |
| if (params->u1.s.mem_fclk_21285) { |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_MEMCLK; |
| tag->hdr.size = tag_size(tag_memclk); |
| tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285; |
| } |
| #endif |
| |
| #ifdef CONFIG_ARCH_EBSA285 |
| if (machine_is_ebsa285()) { |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_VIDEOTEXT; |
| tag->hdr.size = tag_size(tag_videotext); |
| tag->u.videotext.x = params->u1.s.video_x; |
| tag->u.videotext.y = params->u1.s.video_y; |
| tag->u.videotext.video_page = 0; |
| tag->u.videotext.video_mode = 0; |
| tag->u.videotext.video_cols = params->u1.s.video_num_cols; |
| tag->u.videotext.video_ega_bx = 0; |
| tag->u.videotext.video_lines = params->u1.s.video_num_rows; |
| tag->u.videotext.video_isvga = 1; |
| tag->u.videotext.video_points = 8; |
| } |
| #endif |
| |
| #ifdef CONFIG_ARCH_ACORN |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_ACORN; |
| tag->hdr.size = tag_size(tag_acorn); |
| tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg; |
| tag->u.acorn.vram_pages = params->u1.s.pages_in_vram; |
| tag->u.acorn.sounddefault = params->u1.s.sounddefault; |
| tag->u.acorn.adfsdrives = params->u1.s.adfsdrives; |
| #endif |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_CMDLINE; |
| tag->hdr.size = (strlen(params->commandline) + 3 + |
| sizeof(struct tag_header)) >> 2; |
| strcpy(tag->u.cmdline.cmdline, params->commandline); |
| |
| tag = tag_next(tag); |
| tag->hdr.tag = ATAG_NONE; |
| tag->hdr.size = 0; |
| |
| memmove(params, taglist, ((int)tag) - ((int)taglist) + |
| sizeof(struct tag_header)); |
| } |
| |
| void __init convert_to_tag_list(struct tag *tags) |
| { |
| struct param_struct *params = (struct param_struct *)tags; |
| build_tag_list(params, ¶ms->u2); |
| } |